Paper-cutting machine.



N0. 7l0,45l. Patented Oct. 7, I902 N. GRAY, In. PAPER CUTTING MACHINE.

(Application filed Nov. 11, 1901.) {No Model.) 2 Shaets-$heet 3/9 twzasaa W'M/Q' 9.5. i w/ig (No Model.)

Patented Oct. 7, I902.

N. GRAY, In. PAPER CUTTING MACHINE.

(Application filed Nov. 11, 1901.)

2 Shack-Sheet 2.

V I J5 7a a a L i 1 I 6 I I (C Q Q) my. 9 IA UNITED STATES PATENT OFFICE.

NIEL GRAY, JR, OF OSVVEGO, NEW YORK.

PAPER-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 710,451, dated October '7, 1902.

Application filed November 11, 1901. Serial No. 81,826. (No model.)

To all whom, it 71mg concern.-

Be itknown that I, NIEL GRAY, Jr., a citizen of the United States, residing at Oswego, in the county of Oswego and State of New York, have invented certain new and useful Improvements in Paper-Cutting Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates generally to papercuiting machines, and particularly to the mechanism for operating the clamp of that type of machines in which the final pressure is applied to the paper automatically; and it has for its object to provide means for bringing the clamp down gently upon the paper to be out with enough pressure to force the air from between the sheets and compress them slightly, so that the automatic pressure may have its full effect; and it consists of the parts and combinations of parts hereinafter described and claimed.

In the accompanying drawings, forming a part of this specification, Figure l is a side elevation of a paper-cutting machine with the framework at one side removed and showing my invention applied in operative position; Fig. 2, a perspective view from the rear of the machine of the upper part of a paper-cutting machine; Fig. 3, an enlarged detail front view of the treadle and connected parts; Fig. l, a detail perspective view of the rear end of the treadle; Fig. 5, a plan view of the machine with the table removed, and Fig. 6 a front view of the same.

Similar letters refer to similar parts throughout all the views.

Referring to the drawings, A represents the frame of a paper-cutting machine provided with suitable bearings for the shafts and with a longitudinal beam 13, having perforated ears a, between which the treadle (J is ful-. crumed. At its rear end the treadle is formed wedge-shaped or inclined at one side, as at I), (see detail view, Fig. 4,) and engagesa pin 0, adjustably secured at the lower end of a swinging lever D, having its fulcrum between ears d in an upright extension 6 from the rear end of the beam B. The upper end of the lever D is forked, as best shown in Fig. 1, and carries shoes f at each side thereof, which engage in the groove of a spool E of the cone member of aclutch slidingly mounted on the driving-shaft F. The treadle is held in its normal position and returned thereto after having been depressed bya spring g, arranged on a vertical rod projecting from the end of the treadle and working through a lug h on the extension-piece e and against which lug the upper end of the spring bears. The lower or free end of the swinging lever D is normally held in contact with the wedge of the treadle by a spring 2', having its ends in sockets in the extension-piece e and in the le ver D above its fulcrum-point, respectively.

A gear G is cast with or otherwise secured to the cylindrical or female member H of the clutch, which is loosely mounted on the driving-shaft F, said cylindrical member being preferably interiorly coned at each end, so

that it may engage a conical plug I, rigidly I secured to said shaft, in order to increase the frictional engagement between the shaft and said cylinder. The gear G meshes with a gear J, loosely mounted on an intermediate shaft K, and a pinion L, secured to gear J, engages a gear M, keyed to the shaft N, to which is also keyed a gear 0, which meshes with a gear P, loosely mounted on a clamp-shaft Q. Thus upon depressing treadle C the lever D, through its fork, throws the cone or male member of the clutch on the driving-shaft into engagement with the female member, and through the gear G causes the system of gears just described to rotate. The gear Pon clampshaft Q is provided with a lug Z, projecting laterally therefrom, which is adapted to engage the end of an arm R, keyed to the clampshaft, and thus rotate said shaft in the direction of the arrow, Fig. 1, and thus bring the clamp down to the paper by means of the usual pinions m and racks '71. (See Fig. 2.)

To a sheave-wheel S, secured on shaft N, is fastened one end of a chain T, which extends toward the rearof the machine and passes over a sheave U,supported by a bracket V from the frame, and a weightWis attached to the free end of the chain, the object being to have the weight rotate the system of gears in the opposite direction when the treadle is released, and thus remove the lug Z out of the way of the arm'R, so that upon the return of the clamp to its top position the arm will not strike the lug. The chain T winds around sheave S when the clamp is pulled down by the treadle, and when the latter is released the Weight tends to rotate the system of gears in the opposite direction, as stated. There is a certain amount of inertia in the chain of gears which would tend to wind the chain around the sheave S in the opposite direction after reaching the point Where the chain is all unwound When the treadle is released, and if the inertia is sufficient it would cause the chain to rewind on the sheave S to such an extent as to allow the lug to strike the arm on the clam p-shaft. To prevent rewinding in the opposite direction far enough to cause the lug and arm to meet, I cast or otherwise secure a cam-shaped piece 29 to the sheave S, which projects therefrom in a curved line in the plane of the chain T, which increases the diameter upon which the said chain pulls, thus making the action of the weight more effective and stopping the chain of gears quicker.

By the use of my invention the treadle may be kept depressed by the foot, so as to hold the clamp down on the work afterit has been out, which is a desirable feature when cutting narrow unstable piles of paper.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a paper-cutting machine, the combination, with a clamp, a shaft for operating said clamp, and a driving-shaft, of an arm secured to the clamp-shaft, a gear loosely mounted on said clamp-shaft and having a projection adapted to engage said arm, a train of gears connecting said clamp-shaftgear and the driving-shaft, a clutch mounted on said driving-shaft, and a treadle for operating said clutch.

2. In a paper-cutting machine, the combination, with a clamp, a clamp-shaft, and a driving-shaft, of a gear having a lateral projection loosely mounted on the clamp-shaft, an arm rigidly secured to the clamp-shaft and arranged to be engaged by said projection, a clutch arranged on the driving-shaft, a train of gears connecting said clamp-shaft and driving-shaft, means for operating said clutch, and a weight arranged so as to rotate the train of gears in the opposite direction when the clutch is released.

3; In a paper-cutting machine, the combination, with a clamp-shaft, of a driving-shaft, a clutch mounted on said driving-shaft, a train of gears connecting said clamp-shaft and driving-shaft, a shaft operated by said gears, a sheave-wheel mounted on said shaft, a chain having one end connected to said sheave, a weight suspended from the other end of the chain, and a cam-shaped arm extending from the sheave and adapted to engage the chain.

In testimony whereof I affix my signature in presence of two witnesses.

. NIEL GRAY, JR.

WVitnesses:

PATRICK CLANCY, M. H. WILSON. 

